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The Structure of Small Beta Barrels

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The Structure of Small Beta Barrels bioRxiv preprint doi: https://doi.org/10.1101/140376; this version posted May 22, 2017. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. The Structure of Small Beta Barrels Philippe Youkharibache*, Stella Veretnik1, Qingliang Li, Philip E. Bourne*1 National Center for Biotechnology Information, The National Library of Medicine, The National Institutes of Health, Bethesda Maryland 20894 USA. *To whom correspondence should be addressed at [email protected] and [email protected] 1 Current address: Department of Biomedical Engineering, The University of Virginia, Charlottesville VA 22908 USA. 1 bioRxiv preprint doi: https://doi.org/10.1101/140376; this version posted May 22, 2017. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. Abstract The small beta barrel is a protein structural domain, highly conserved throughout evolution and hence exhibits a broad diversity of functions. Here we undertake a comprehensive review of the structural features of this domain. We begin with what characterizes the structure and the variable nomenclature that has been used to describe it. We then go on to explore the anatomy of the structure and how functional diversity is achieved, including through establishing a variety of multimeric states, which, if misformed, contribute to disease states. We conclude with work following from such a comprehensive structural study. Introduction Why small beta barrels are interesting? Small beta barrels possess several intriguing features as discussed subsequently. When taken together these features make this protein structural domain an interesting study from the perspective of structure, function and evolution. Small beta barrels occupy an extremely broad sequence space. In other words, many small barrels with similar structures and functions have little or no detectable sequence similarity, yet the folding process is robust and insensitive to the majority of sequence variations. Consequently, small barrels can be tuned for a variety of functions through variations in sequence and structural modifications to the core structural framework as described herein. Small beta barrels interact with RNA, DNA and protein; sometimes with two partners simultaneously . Small barrels are evolutionary ancient, being found in viruses, bacteria, 2 bioRxiv preprint doi: https://doi.org/10.1101/140376; this version posted May 22, 2017. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. archaea and eukaryotes and act as fundamental components in diverse biological processes. For example, RNA biogenesis (including splicing, RNAi, sRNA) [1–4], structural organization of DNA [5] initiation of signaling cascades through DNA recognition (recombination, replication and repair, inflammation response, telomere biogenesis) [6–8] The recognition of histone tails by small barrels lies in the heart of chromatin remodeling [9], while recognition of polyproline signature makes the small barrel an ultimate adaptor domain in regulatory cascades [10]. Small beta barrels function as a single domain protein, or as part of a multi-domain protein. They also function as quaternary structures through toroid rings assembled from individual small beta barrels. Results and Discussion What characterizes the structure of a small beta barrel? There are many folds named beta barrels: 53 folds in SCOPe 2.06 [11] carry a definition of barrel or pseudo-barrel and 79 X-groups appear under the architecture of beta barrel in the ECOD classification [12]. While not defined as such in the literature, here we define small beta barrels as domains, typically 60-120 residues long, with a superimposable core of approximately 35 residues, which belong to SCOP (v.2.06) folds b.34 (SH3), b.38 (SM-like), b.40 (OB), b.136 (stringent starvation protein), and b.137 (RNase P subunit p29). Given the structural and functional plasticity of small beta barrels, to provide focus, this paper concentrates on the first three folds (b.34, b.38 and b.40) which contribute the vast majority of structures and functions represented by small beta barrels. In general, beta-barrels can be thought of as a beta sheet that twists and coils to form a closed structure in which the first strand is hydrogen bonded to the last [13,14]. This type of barrel is often described as consisting of a strongly bent antiparallel beta sheet [15–17], or as a beta sandwich [18]. Classically, barrels are defined by the number of strands n and the shear number S [14,19]. Shear number S determines the extend of the stagger of the beta sheet, or 3 bioRxiv preprint doi: https://doi.org/10.1101/140376; this version posted May 22, 2017. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. the tilt of the barrel with respect to its main axis. The extent of the stagger defines the degree of twist and coil of the strands and the internal diameter of the barrel [13,14]. It is proposed that the increase in S (or tilt of the barrel) increases throughout evolution [20]. The subset of biologically relevant (n, S) pairs found in nature is rather limited, as was described by Murzin and co-workers: n<=S<=2n. Specifically, the combinations that are observed are S=8, n=4 to 8; S=10, n=5 to 10; S=12, n=12 [13]. Barrels can also be thought of as consisting of 2 beta sheets packed face-to-face and orthogonal to each other [21]. By this definition barrels have higher staggering and are flatter, so the two opposite sides pack together. As such small beta barrels are of this orthogonal type with low strand number, n, and high shear number S: n=4, S=8. In SCOPe version 2.06, b.34 and b.38 are defined as n=4, S=8 with an SH3 topology, while the OB fold b.40 is defined as n=5, S=10. Usually the 4th strand, as defined in SCOP for b.34 and b.38, is interrupted by a 3-10 helix, breaking it into 5 strands. In this work (as in most publications) small beta barrels are defined as containing 5 strands and represented by two orthogonally packed sheets. In the following however we will consider the highly bent second strand β2 as composed of two parts β2N and β2C as each will participate in the two orthogonally packed beta sheets of this barrel. This work surveys a significant number of small barrel protein structures representative of different functional classes. By no means complete, we believe it to be the largest such survey to date. Table 1 summaries the specific proteins discussed in this paper. Protein/domain name Ligand SCOP PDB ID nomenclature Chromo (sac7d, sso7d) DNA, peptide b.34.13.1 1WD1, 1KNA, 1Q3L FMRP RNA b.34.9.1 4QW2 Hfq (Sm-like) RNA b.38.1.2 1KQ2, 3GIB, 2YLC HIN domain DNA, protein b.40.16 4LNQ, 3RN5 Interdigitated Tudor (JMJD2A) peptide b.34.9.1 2QQR, 2GF7 4 bioRxiv preprint doi: https://doi.org/10.1101/140376; this version posted May 22, 2017. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. Kin-17 RNA not classified 2CKK Mpp8 peptide b.34.13 3QO2 OB-fold (Shiga-like toxin) oligosaccharides b.40.2.1 1C4Q, 1BOS PAZ RNA b.34.14 4W5N,1SI3, 3O7X Plus3 DNA, protein b.34.21 2BZE Retroviral integrase dsDNA b.34.7.1 5EJK, 4FW1 RNaseP RNA b.137.1 1TS9, 2KI7 SH3-like (polyPro) peptide b.34.2 1CKA, 1SEM, 1PSK, 2JXB SH3-like embedded in OB-fold RNA, protein b.40.4.5, b.34.5.3 3OMC, 3NTK, 4Q5Y (eTud) Sm-like/lsm RNA b.38.1.1 1D3B, 4WZJ, 3PGW, 4M7A, 4M75, 3S6N, 4C8Q Spt5 RNA b.34.5.5 4YTK Tandem OB-SH3-like (RL2, eIF5A) RNA b.40.4.5, b.34.5.3 1S72, 3CPF, 4V88 Tandem Tudor (53BP1) protein, DNA b.34.9.1 2MWO, 1SSF, 2G3R, 3LGL TrmB sugars b.38.5.1 2F5T Table 1. Proteins used in this work. The underlined PDB ID indicates the structure used in the figures. The reference structure, Hfq, is in bold. What nomenclature is used to describe the structure of small beta barrels? Over decades, several independent nomenclatures for the loops within sub-groups of small barrels have emerged. The three most prominent nomenclatures are as follows (Table 2). First, are SH3-like barrels involved in signal transduction through binding to polyPro motifs (b.34.2) as well as chromatin remodeling through recognizing specific modifications on histone tails by Chromo-like (b.34.13) and Tudor-like (b.34.9). Second, are Sm-like barrels involved broadly in RNA biogenesis (b.38.1) and third are OB-fold barrels involved in cellular signaling through binding to nucleic acids and oligosaccharides (b.40). To be consistent throughout this paper and 5 bioRxiv preprint doi: https://doi.org/10.1101/140376; this version posted May 22, 2017.
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